7075

[Jptiger]

I have some parts to weld out of 7075 aluminum. I've done some build-up on a part that milled to short with 5356 it worked ok. But joining parts? What's the best filler to use

[aametalmaster]

I didn't think it was weldable...Bob
http://www.esabna.com/us/en/educatio...4-and-7075.cfm

[urch55]

My Alro book shows it can be spot welded but not fusion welded.

[shovelon]

4043 is ok, but just ok.

[SundownIII]

Perhaps we'd be better off if certain posters didn't just "pull an answer out of their azz".

What supporting documentation do we have that 4043 is OK as a filler for 7075?

Seems the OP would be better served by reading the link provided by aametalmaster rather than taking the word of someone "shooting from the hip".

[usmcpop]

Another article:

http://archive.metalformingmagazine....00/06/Alum.pdf

[urch55]

Ok, Here is a copy to support my statement. No azz pulling here.

[SundownIII]

urch,

PM sent.

My comment was not directed at you in any manner. You and aametalmaster gave the CORRECT answer.

[vicegrip]

A fundamental part of being a "Metal-Worker" in any capacity,
but especially occupational..............

Is to understand the attributes and quallities of the alloys being sellected.
7075 is the Godzilla of aluminum. Machinabillity out of this world.

Highest strenght possible!! Intended to render a net component..........
............by removal ONLY.......... not build-up or joining.

To attempt welding (joining) this alloy is .....???
An "infraction" to be polite.
vg

[shovelon]

4043 is ok, but just ok.

I will take this statement back and just say don't under any circumstances try to weld this alloy.

Don't fill holes, or do any kind of build up. Don't repair washed out corners, or dings on 7075 molds and dies. Don't for whatever reason cap off plugs or weld 7075 standoffs to any other 7075 parts or assembly.

Don't do test welds, or any samples, or first articles, or anything else. Don't even try.

Sorry for offering any type of reply.

P.S. Never, ever, under any circumstance try to anneal, bend, weld with 5183, and retemper 7075 to original hardness.

[vicegrip]

I will take this statement back and just say don't under any circumstances try to weld this alloy.

Don't fill holes, or do any kind of build up. Don't repair washed out corners, or dings on 7075 molds and dies. Don't for whatever reason cap off plugs or weld 7075 standoffs to any other 7075 parts or assembly.

Don't do test welds, or any samples, or first articles, or anything else. Don't even try.

Sorry for offering any type of reply.

P.S. Never, ever, under any circumstance try to anneal, bend, weld with 5183, and retemper 7075 to original hardness.

I used to make replacement parts for DC-9's.
I can see where you are coming from.

I would try another audition for our good humor club mascot.
Cheers.
vg

[wmgeorge]

I will take this statement back and just say don't under any circumstances try to weld this alloy.

Don't fill holes, or do any kind of build up. Don't repair washed out corners, or dings on 7075 molds and dies. Don't for whatever reason cap off plugs or weld 7075 standoffs to any other 7075 parts or assembly.

Don't do test welds, or any samples, or first articles, or anything else. Don't even try.

Sorry for offering any type of reply.

P.S. Never, ever, under any circumstance try to anneal, bend, weld with 5183, and retemper 7075 to original hardness.

Sounds like you are doing plastic injection die work. You must not of have done an online search otherwise it would be impossible! Thanks for posting.

[shovelon]

Sounds like you are doing plastic injection die work. You must not of have done an online search otherwise it would be impossible! Thanks for posting.

You are correct on both counts.

1. I did no research. I shot from the hip from experience.

2. Yes, I repair 7075 molds. Most of them are just plain worn out, and need some buildup to eliminate the flash, hence 4043 and peened to smash possible porosity. Others are missing gates or tabs or need inserts welded, hence preheat and 5183. And some need pockets filled and holes closed.

I will admit 7075 would not be of my choosing for a welded structure.

[SundownIII]

Posters are referred back to the OP's original comments/questions.

"But joining parts? What's the best filler to use"

No "standard process" is going to yield satisfactory results for joining 7075. The weld may look ok, but it's not.

If "joining" parts is the OP's objective, then it's time for the screws, bolts, or rivets.

[shovelon]

Posters are referred back to the OP's original comments/questions.

"But joining parts? What's the best filler to use"

No "standard process" is going to yield satisfactory results for joining 7075. The weld may look ok, but it's not.

If "joining" parts is the OP's objective, then it's time for the screws, bolts, or rivets.

For the most part, I will agree with you.